HCID 87194381, compound → HCID 86635616, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 2-methyl-N-{(1E)-[5-(2,2,2-trifluoroethoxy)pyridin-2-yl]methylidene}propane-2-sulfinamide (10.0 g, 32.4 mmol) and tetrahydrofuran (150 ml) at −78° C. was added dropwise 1.0M vinylmagnesium bromide in tetrahydrofuran (58.4 ml, 58.4 mmol), maintaining temperature during addition below −70° C. Reaction was stirred at −78° C. for an hour. To complete reaction, an additional amount of 1.0M vinylmagnesium bromide (19.4 ml, 19.4 mmol) was required. The reaction was then quenched by pouring mixture into a cold solution of saturated NH4Cl (800 ml) and ethyl acetate (600 ml) with vigorous stirring at 0° C. Layers were separated and organic extracts were combined, dried over Na2SO4, filtered and concentrated in vacuum. The resulting brown oil was purified by flash chromatography (Si2O, 25-100% ethyl acetate in hexanes, gradient) to give 2-{(1R)-1-[(tert-butylthio)amino]prop-2-enyl}-5-(2,2,2-trifluoroethoxy)pyridine as a white solid (8.10 g, 73.5%). 1H NMR (400 MHz, CDCl3) 8.30 (d, J=2.8 Hz, 1H), 7.28 (m, 2H), 5.92-5.83 (m, 1H), 5.34 (dd, J=16 Hz and 33 Hz, 2H), 5.01 (m, 1H), 4.99 (bs, 1H), 4.39 (q, J=8.0 Hz, 2H), 1.28 (s, 9H); MS (Electrospray): m/z 337.1 (+H).

Provenance & Evidence